US5176230A - Carbon friction strip with a damage detection facility - Google Patents

Carbon friction strip with a damage detection facility Download PDF

Info

Publication number
US5176230A
US5176230A US07/715,764 US71576491A US5176230A US 5176230 A US5176230 A US 5176230A US 71576491 A US71576491 A US 71576491A US 5176230 A US5176230 A US 5176230A
Authority
US
United States
Prior art keywords
tube
strip
wearing
groove
friction strip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/715,764
Other languages
English (en)
Inventor
Patrick Odot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CARNONE LORRIANE APPLICATIONS ELECTRIQUES
Original Assignee
Carbone Lorraine SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carbone Lorraine SA filed Critical Carbone Lorraine SA
Assigned to LE CARBONE-LORRAINE A CORP. OF FRANCE reassignment LE CARBONE-LORRAINE A CORP. OF FRANCE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ODOT, PATRICK
Application granted granted Critical
Publication of US5176230A publication Critical patent/US5176230A/en
Assigned to CARNONE LORRIANE APPLICATIONS ELECTRIQUES reassignment CARNONE LORRIANE APPLICATIONS ELECTRIQUES ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LE CARBONE LORRAINE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L5/00—Current collectors for power supply lines of electrically-propelled vehicles
    • B60L5/04—Current collectors for power supply lines of electrically-propelled vehicles using rollers or sliding shoes in contact with trolley wire
    • B60L5/08—Structure of the sliding shoes or their carrying means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L5/00—Current collectors for power supply lines of electrically-propelled vehicles
    • B60L5/18—Current collectors for power supply lines of electrically-propelled vehicles using bow-type collectors in contact with trolley wire
    • B60L5/20—Details of contact bow
    • B60L5/205—Details of contact bow with carbon contact members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2200/00—Type of vehicles
    • B60L2200/26—Rail vehicles

Definitions

  • the invention relates to a carbon friction strip which includes a damage detection facility.
  • the friction strip is used for transferring electrical energy between a fixed energy distribution means, such as a wire, and an energy consuming movable appliance, such as an underground train or traction vehicle.
  • British Patent GB 1 374 972 describes a carbon friction strip comprising a damage detection device.
  • the friction strip is provided with a tubular receptacle containing a fluid so that in the event of excessive wear, or in the event of breakage of the friction strip, the tubular receptacle is ruptured, the escape of fluid is detected, and the pantograph which carries the friction strip is retracted.
  • friction strip (1) is shown diagrammatically in cross-section in FIG. 6.
  • a groove (3) is disposed over the entire length of the wearing strip (2), on the stirrup side (5), in which the tube (4) supplied with fluid is secured by adhesion.
  • the tube (4) may be of silicone rubber, or of other materials, particularly plastics materials such as PTFE, which are capable of withstanding an operating temperature of, for example, 200° C.
  • the tubular receptacle may be constituted by the groove itself, the open surface of which is rendered leak-proof by means of an adhesive product such as a synthetic rubber.
  • Patent EP 078 159 stipulates the limits of the initial invention described in GB 1 374 972. Detection occurs only after rupture or excessive wear and tear of the friction strip, that is to say, with a risk of damage to the pantograph and the overhead contact line.
  • the Patent EP 0 78 159 which sets out to improve the fault detection sensitivity, proposes a method which does not provide complete satisfaction because detection occurs only after the moment when the tubular receptacle of flexible elastomer is no longer being supported. Further, there are various kinds of damage to the friction strip which are likely not to be detected by this method since they do not necessarily produce an absence of local support at the level of the tubular receptacle. Thus, for example, there may occure the appearance of fissures on the friction strip following a thermal or physical shock, with no significant change in the support of the tubular receptacle to cause rupture and therefore damage is not detected. This is the reason why the applicant has sought a better solution to this problem.
  • a friction strip (1) which is used for the transfer of electrical energy to rolling stock, constituted by a wearing strip (2) of carbon based electrically conductive material, comprising a device for detecting damage to the wearing strip and on the face of the wearing strip (2) which is in contact with a stirrup member (5) serving as a support, a groove (3) over substantially the entire length of the wearing strip (2) on which there is placed a leak-proof tube (4) containing a pressurized fluid serving as a detector.
  • the friction strip is characterized in that the material constituting the tube (4) displays mechanical characteristics, particularly mechanical strength, resilience and thermo-mechanical (expansion coefficient) which comes close to those of the material constituting the wearing strip (2).
  • the depth (9) of the groove (3) is selected to be greater than the height of the jaws (8) of the stirrup member (5) so that the tube (4) will timely detect wear and tear before the limit of use of the wearing strip (2) is reached.
  • the tube (4) and the wearing strip (2) are rendered rigid by means which does not oppose the propagation of the damage from the wearing strip (2) to the tube (4).
  • the term "damage” is intended mainly to mean fissures which may appear on the wearing strip as the result of any type of stress, particularly mechanical and thermal shocks.
  • the applicant avoids the use of all impact tubes consisting of plastic material, particularly those of the prior art and also those of metallic alloy because they lack sensitivity to damage.
  • the tube (4) is carbon based and belongs to the same chemical family as the wearing strip (2). It must be able to withstand a pressure of at least one MPa (10 bars), this pressure being generally that of the compressed air on a locomotive.
  • FIG. 1 shows a cross-section through a friction strip according to the invention.
  • FIG. 2 shows a cross-section through a stirrup member (5) adapted to the friction strip in FIG. 1.
  • FIG. 3 shows a cross-section through the friction strip in FIG. 1, mounted on the stirrup member in FIG. 2.
  • FIG. 4 shows a cross-section through a friction strip with a flush mounted tube and maintained by a glue seal (11) in the bottom of the groove, the cross-section of which is partly semi-circular.
  • FIG. 4 also shows the overhead contact wire (7).
  • FIG. 5 shows a cross-section and a longitudinal section through a wearing strip showing the three-face wearing surface of the wearing strip with a cross-section of the overhead contact wire (7).
  • FIG. 6 shows a cross-section through a friction strip and its stirrup member according to the prior art.
  • FIG. 7 shows a non-self-supporting stirrup member which may be used in accordance with the invention.
  • FIG. 8 shows in longitudinal section an example of connection of the tube (4) rigid with the wearing strip (2), to the detection device (13) not shown, using an elbow-shaped socket (14).
  • the composition of carbon chosen for the tube (4) has a resistance to wear which is at most equal to that of the composition of carbon chosen for the wearing strip (2). Indeed, it is important that the tube should wear by friction at least as easily as the wearing strip so that it is capable to detect damage to the wearing strip before the safe operating limits are reached.
  • the basic materials constituting the tube and the wearing strip are known per se. Typically, they are obtained as follows:
  • solid profiled sections of fired carbonated material are obtained which are slightly porous due to distillation of part of the binder.
  • These fired profiled sections are then able to undergo various treatments known per se such as impregnation with resin, metallic impregnation, treatments intended either to reduce the porosity, which is essential in the case of the tube (4), or to enhance the mechanical characteristics or electrical properties, or in order to favor slip in order to ensure a low weight of wear due to friction, or even to render the friction strip impermeable so that it is insensitive to water or dampness.
  • the crude profiled sections obtained after firing and various treatments are cut to length, machined and prepared for final assembly of the tube and of the wearing strip.
  • the crude profiled sections corresponding to the wearing strip may, at this stage, be bars of any cross-section, or they may also be bars which already have some of their final dimensions and which may, for instance, have a cross-section, such as in FIG. 1, with the grooves (3) and lateral restrictions (6) for fixing the friction strip on the stirrup member (5). Machining of the wearing strip makes it possible to achieve the final dimensions of the friction strip and to carry out what has not yet been done at the profiled section stage, such as the longitudinal profile as shown in FIG. 5.
  • the surface of the friction strip which is in contact with the electrical energy distributor element, often an overhead contact wire (7) in the case of rail transport generally has a friction surface with three faces with a central plane parallel with the base of the friction strip and two slightly inclined lateral faces; it is at the level of the central plane that the transfer of electrical energy is essentially performed and it is therefore at this level that the friction strip has its maximum thickness.
  • the friction strip is not necessarily constituted by faces. It may have a rounded shape, for example, that of a flattened semi-ellipse.
  • the wearing strip may be constituted of several parts which are connected by bevelled edges and which are assembled by any known means, for example, by having their facing surfaces glued.
  • the groove (3) is selected to be of a height which is at least equal to the height of the restriction (6), which is therefore also the height of the jaw (8) of the stirrup member (5) so that when the wearing strip is worn, the wire (7) reaches the groove (3) and its associated tube (4) and triggers the wear signal before the top end of the generally metallic stirrup member is reached, which might result in damage to the electrical energy distribution network, for example, the overhead contact wire (7).
  • the actual shape of the groove is not in itself critical and is often related to the shape of the tube; it may be of rectangular cross-section, as shown in FIG. 1, or its cross-section may have a semi-circular portion, as shown in FIG. 4, or a square, triangular, semi-elliptical or other cross-section.
  • the relative geometry of the groove and of the tube may allow either a narrow contact between groove and tube, such as for example shown in FIG. 4, or there may be a more limited contact, as shown for example in FIG. 3.
  • Assembly of the tube (4) and of the wearing strip (2) by fixing the tube in the groove (3) may be accomplished by any known means.
  • the two preferred embodiments of tube and wearing strip assembly according to the invention are either to have the tube fitting flush in the groove, as shown for example in FIG. 4, or the tube may be glued into the groove, or there may be a combination of both methods.
  • Flush fitment of the tube (4) in the groove (3) is possible according to the invention for various closely related cross-sections of tubes and grooves.
  • a tube of square cross-section fitting into a groove the cross-section of which is closely related so that there is a very large area of contact between the tube, the "monitoring” material, and the wearing strip, the “monitored” material.
  • a tube of circular cross-section will be flush-fitted into a groove of which a portion is semi-circular, such as for example that shown in FIG. 4.
  • a glue seal (11) is used to render the tube rigid with the groove.
  • the adhesive is of the type which hardens by polymerization in an oven (a thermo-hardening adhesive) so that the layer of adhesive transmits faults or stresses in the "monitored" material to the "monitoring" material with the greatest possible sensitivity.
  • Elastomer or thermoplastics based adhesives can be used according to the invention, but they are not preferred because they less readily propagate the stresses than do the harder or more resilient adhesives.
  • thermo-hardening adhesives it is possible to mention those which are phenolic resin or epoxy resin based.
  • the ends of the tubes will be fitted with means permitting connection of the tube end to a detection device, the other end being closed.
  • the detection device maintains a pressurized fluid in the tube and detects fluctuations in pressure or rate of flow which would result from a leakage due either to normal wear and tear on the friction strip, or the appearance of a defect, such as a split.
  • the friction strip (1) obtained after assembly of the tube (4) and of the wearing strip (2) is then generally mounted and fixed on a metallic stirrup member (5) for its final use, for example, on a pantograph.
  • the stirrup member (5) as shown in FIG. 2, is of the "self-supporting" type. It is also possible to use a stirrup member which is not self-supporting and which may in cross-section be of the shape shown in FIG. 7.
  • the main advantage of the invention is the great sensitivity with which faults are detected. Although this property cannot be readily quantified, the applicant has observed that the wearing strip of the friction strip according to the invention did not suffer any damage, for example a split caused by a shock, without the tube being likewise damaged and split.
  • This is the result of the concept developed within the invention, in other words, the use of two materials, a "monitored” material and a “monitoring” material, which have closely related properties, such as mechanical strength and resilience, particularly, and their association by flush fitment or with the help of an adhesive does not substantially impair propagation of damage from the wearing strip (2) to the detector tube (4).
  • an amorphous carbon wearing strip (reference AR 129 of the Societe Le Carbone Lorraine) was produced from mixtures of powdered coke, graphite and pitch. This mixture was compressed to form a cylindrical "ball” of 400 mm diameter and with a height of 1000 mm. This "ball” was extruded producing a profiled section having substantially the largest cross-section of the finished wearing strip. It was cut into bars of equal length which were fired in an oven at a temperature of around 1300°.
  • the profiled section was cut to the length of the final wearing strip (696 mm) and it was grooved by machining. It is likewise possible to obtain a groove by a drawing or extrusion process, but in this case, there are risks of the material bursting when fired due to distortions introduced by the groove.
  • the part of the profiled section intended to be in contact with the jaws (8) of the stirrup member was then coppered and tinned, this part corresponding to the zone of the lateral constrictions (6) having been coppered and tinned by masking the part not intended to be coppered and tinned.
  • a leak-proof carbon tube was then produced.
  • a ball constituted by powders and binders close in their nature to those used for the wearing strip, but in the case of the powders, of smaller granulation in order to obtain a final tube of considerable resistance to leaks was extruded.
  • a profiled section tube was produced which was cut to the length of 1500 mm in order to be fired. The profiled section tube was fired at around 1300° C.
  • the profiled tube was impregnated with a thermosetting resin, for example a phenolic resin, which was polymerized at 200° for a few hours (the resultant material corresponds to reference JP 445 of the Societe Le Carbone Lorraine).
  • a thermosetting resin for example a phenolic resin
  • Each end of the tube was then connected to an aluminum elbow-shaped socket (14), as shown in FIG. 8, by flush fitment and gluing of the end of the tube into one of the orifices of the elbow-shaped socket, the other orifice of the elbow-shaped socket being provided with an internal thread for connection to the detection system (13) while having on the outside a square cross-section in order to allow the socket, once it has been positioned on the stirrup member, to be rotationally locked.
  • a first sealing test was conducted at 1.5 MPa: no bubbles appeared under this pressure.
  • the tube provided with its elbow-shaped sockets and the wearing strip was then assembled by introducing an adhesive consisting of a graphite powder filled phenolic resin into the groove in the wearing strip and by then applying the tube in such a way that the tube is in the bottom of the groove, in contact with the wearing strip, the two elbow-shaped sockets emerging at right-angles to the base of the wearing strip.
  • the phenolic resin was polymerized at around 80° C.
  • a friction strip which comprised a wearing strip rigid with a detector tube provided with sockets for a leak-proof connection to a leakage detection system.
  • the friction strip and the stirrup member were assembled by snap-fitment of the friction strip into the stirrup member by virtue of the elasticity of the edges of the stirrup member.
  • orifices (15) were cut into the ends of the plate (12) of the stirrup member (5) and they were sufficiently wide to allow passage of the sockets (14), threaded on the inside and of an external square cross-section.
  • On each socket of square cross-section was slid a plate (16) with a square hole of substantially the same square outer cross-section as the socket with a slight clearance allowing sliding and it was fixed to the stirrup member, for example by means of rivets in order to rotationally lock the threaded socket (14) and allow a tightly sealed connection to the detection device (13).
  • the upper part of the friction strip was then machined in such a way as to provide a three-face friction surface, with a central plane parallel with the base of the friction strip and with two slightly inclined lateral faces.
  • the friction strip was then treated with paraffin to make it impermeable to water and then, under the same conditions as previously, the tightness of the tube was checked for leakage.
  • Damage detection sensitivity test a wearing strip provided with its detector tube is subjected to an impact resistance test (the mass being released from a certain height and striking the wearing strip-Charpy drop tester type). It was observed that there was simultaneity between appearance of the split in the wearing strip and detection of the fault.
  • Fatigue resistance test in normal operation, the friction strip may be subjected to flexing, mainly in a vertical direction.
  • the friction strip was subjected to an alternating flexing by applying an alternating stress to the center of the strip, the two ends of which resting on supports. Flexing produced a sag the amplitude of which ranged from 0.5 to 1 mm.
  • the appearance and propagation of a split was observed either to have a sag of greater amplitude than 1 mm or beyond 10 6 cycles. This test demonstrates the good resistance of the friction strip to fatigue and confirms the damage detection sensitivity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
  • Investigating And Analyzing Materials By Characteristic Methods (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Blast Furnaces (AREA)
  • Secondary Cells (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Braking Arrangements (AREA)
  • Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
  • Primary Cells (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
US07/715,764 1990-06-20 1991-06-14 Carbon friction strip with a damage detection facility Expired - Lifetime US5176230A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9007974 1990-06-20
FR9007974A FR2663592B1 (fr) 1990-06-20 1990-06-20 Bande de frottement en carbone avec detection d'avaries.

Publications (1)

Publication Number Publication Date
US5176230A true US5176230A (en) 1993-01-05

Family

ID=9397983

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/715,764 Expired - Lifetime US5176230A (en) 1990-06-20 1991-06-14 Carbon friction strip with a damage detection facility

Country Status (12)

Country Link
US (1) US5176230A (fr)
EP (1) EP0462909B1 (fr)
JP (1) JP3315709B2 (fr)
KR (1) KR970010585B1 (fr)
AT (1) ATE120141T1 (fr)
CA (1) CA2044900C (fr)
DE (1) DE69108304T2 (fr)
DK (1) DK0462909T3 (fr)
ES (1) ES2069862T3 (fr)
FR (1) FR2663592B1 (fr)
GR (1) GR3015534T3 (fr)
ZA (1) ZA914713B (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5244065A (en) * 1989-05-03 1993-09-14 Hoffmann & Co. Elektrokohle Gesellschaft Mbh Pantograph slipper for current collectors
DE9316425U1 (de) * 1993-10-27 1994-01-13 Hoffmann & Co. Elektrokohle Ges.M.B.H., Steeg Schleifleiste für Stromabnehmer
US5969233A (en) * 1997-04-14 1999-10-19 Le Carbone Lorraine Carbon current collecting shoe with damage detector for operation with a high current electrical power supply
US20090211861A1 (en) * 2005-04-08 2009-08-27 Fumio Okimoto Collector Shoe Device
US20110315497A1 (en) * 2008-12-19 2011-12-29 Mersen France Amiens Sas Medium for an electric current collection strip
US20130270050A1 (en) * 2010-09-30 2013-10-17 Toyo Electric Mfg., Ltd. Impact mitigating structure of contact strip piece
US9120386B2 (en) 2009-12-09 2015-09-01 Hoffmann & Co., Elektrokohle Ag Sensor element for a sensor device
CN110303891A (zh) * 2019-07-17 2019-10-08 西南交通大学 含减震结构的自润滑模块化金属滚筒电力机车受电弓弓头
CN110779863A (zh) * 2019-11-06 2020-02-11 江苏集萃安泰创明先进能源材料研究院有限公司 一种评价非晶合金薄带残余热应力的方法
CN111819102A (zh) * 2018-02-15 2020-10-23 法维莱运输图尔公司 受电弓的接触片，以及对应的铁路车辆和监测方法
US11466707B2 (en) * 2018-05-01 2022-10-11 Kyb Corporation Fluid leakage detection system and fluid pressure system

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5351794A (en) * 1990-10-04 1994-10-04 Manfred Deutzer Current collector holder for a carbon shoe
CN101722860B (zh) * 2008-10-15 2011-08-10 苏州东南电碳科技有限公司 电力机车受电弓滑板及其制造方法
ITMO20090072A1 (it) * 2009-03-25 2010-09-26 Laura Bellicoso Dispositivo di captazione di energia elettrica
FR3000442B1 (fr) 2012-12-27 2016-07-15 Mersen France Amiens Sas Detection d'avarie d'une bande de captage
CN104772827B (zh) * 2015-04-27 2016-05-04 浙江晨龙锯床股份有限公司 高铁受电弓碳滑板自动化加工设备及其加工方法
WO2019068990A1 (fr) 2017-10-03 2019-04-11 Faiveley Transport Tours Bande de frottement d'un pantographe pour vehicule ferroviaire, procédé de fabrication et procédé de surveillance d'une telle bande, système de surveillance de l'usure d'une telle bande et véhicule ferroviaire
CN107757377B (zh) * 2017-11-27 2020-06-16 大同新成新材料股份有限公司 一种气道托架一体式受电弓碳滑板
DE102018110902B4 (de) * 2018-05-07 2021-01-21 Pantrac Gmbh Vorrichtung zur Befestigung eines Schleifelements an einem Stromabnehmer
JP7084482B2 (ja) * 2018-07-23 2022-06-14 東洋電機製造株式会社 パンタグラフ

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3394365A (en) * 1966-11-17 1968-07-23 Raymond N. Nealis Pantograph shoes and condition indicator
GB1374972A (en) * 1971-11-25 1974-11-20 Morganitie Carbon Ltd Current collectors for use with overhead power cables
EP0000980A1 (fr) * 1977-08-25 1979-03-07 AIRCO, Inc. Contacteur collecteur de courant en charbon et dispositif pantographe
US4578546A (en) * 1981-10-22 1986-03-25 Morganite Electrical Carbon Limited Electric traction current-collector
WO1989012560A1 (fr) * 1988-06-23 1989-12-28 Hoffmann & Co. Elektrokohle Gesellschaft M.B.H. Semelle pour collecteur et procede de fabrication
DE3905962C1 (fr) * 1989-02-25 1990-04-26 Schunk Bahntechnik Ges.M.B.H., Salzburg, At

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3394365A (en) * 1966-11-17 1968-07-23 Raymond N. Nealis Pantograph shoes and condition indicator
GB1374972A (en) * 1971-11-25 1974-11-20 Morganitie Carbon Ltd Current collectors for use with overhead power cables
EP0000980A1 (fr) * 1977-08-25 1979-03-07 AIRCO, Inc. Contacteur collecteur de courant en charbon et dispositif pantographe
US4578546A (en) * 1981-10-22 1986-03-25 Morganite Electrical Carbon Limited Electric traction current-collector
WO1989012560A1 (fr) * 1988-06-23 1989-12-28 Hoffmann & Co. Elektrokohle Gesellschaft M.B.H. Semelle pour collecteur et procede de fabrication
DE3905962C1 (fr) * 1989-02-25 1990-04-26 Schunk Bahntechnik Ges.M.B.H., Salzburg, At

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5244065A (en) * 1989-05-03 1993-09-14 Hoffmann & Co. Elektrokohle Gesellschaft Mbh Pantograph slipper for current collectors
DE9316425U1 (de) * 1993-10-27 1994-01-13 Hoffmann & Co. Elektrokohle Ges.M.B.H., Steeg Schleifleiste für Stromabnehmer
US5969233A (en) * 1997-04-14 1999-10-19 Le Carbone Lorraine Carbon current collecting shoe with damage detector for operation with a high current electrical power supply
US20090211861A1 (en) * 2005-04-08 2009-08-27 Fumio Okimoto Collector Shoe Device
US7870938B2 (en) * 2005-04-08 2011-01-18 Central Japan Railway Company Collector shoe device
US8596435B2 (en) * 2008-12-19 2013-12-03 Mersen France Amiens Sas Medium for an electric current collection strip
US20110315497A1 (en) * 2008-12-19 2011-12-29 Mersen France Amiens Sas Medium for an electric current collection strip
US9120386B2 (en) 2009-12-09 2015-09-01 Hoffmann & Co., Elektrokohle Ag Sensor element for a sensor device
US20130270050A1 (en) * 2010-09-30 2013-10-17 Toyo Electric Mfg., Ltd. Impact mitigating structure of contact strip piece
US9352654B2 (en) * 2010-09-30 2016-05-31 East Japan Railway Company Impact mitigating structure of contact strip piece
CN111819102A (zh) * 2018-02-15 2020-10-23 法维莱运输图尔公司 受电弓的接触片，以及对应的铁路车辆和监测方法
US11466707B2 (en) * 2018-05-01 2022-10-11 Kyb Corporation Fluid leakage detection system and fluid pressure system
CN110303891A (zh) * 2019-07-17 2019-10-08 西南交通大学 含减震结构的自润滑模块化金属滚筒电力机车受电弓弓头
CN110303891B (zh) * 2019-07-17 2024-05-28 西南交通大学 含减震结构的自润滑模块化金属滚筒电力机车受电弓弓头
CN110779863A (zh) * 2019-11-06 2020-02-11 江苏集萃安泰创明先进能源材料研究院有限公司 一种评价非晶合金薄带残余热应力的方法
CN110779863B (zh) * 2019-11-06 2022-03-29 江苏集萃安泰创明先进能源材料研究院有限公司 一种评价非晶合金薄带残余热应力的方法

Also Published As

Publication number Publication date
DK0462909T3 (da) 1995-07-24
DE69108304D1 (de) 1995-04-27
FR2663592B1 (fr) 1992-09-04
ZA914713B (en) 1992-05-27
GR3015534T3 (en) 1995-06-30
JP3315709B2 (ja) 2002-08-19
EP0462909B1 (fr) 1995-03-22
ES2069862T3 (es) 1995-05-16
FR2663592A1 (fr) 1991-12-27
DE69108304T2 (de) 1995-08-10
CA2044900C (fr) 1995-05-30
ATE120141T1 (de) 1995-04-15
KR920000533A (ko) 1992-01-29
JPH04271202A (ja) 1992-09-28
CA2044900A1 (fr) 1991-12-21
KR970010585B1 (ko) 1997-06-28
EP0462909A1 (fr) 1991-12-27

Similar Documents

Publication Publication Date Title
US5176230A (en) Carbon friction strip with a damage detection facility
US11911975B2 (en) Carbon fiber reinforced plastic electrofusion fitting and a self-monitoring method of strain
US20070014965A1 (en) Gasket material for use in high pressure, high temperature apparatus
US4986511A (en) Seal structure for elevated temperature service
CN101260787A (zh) 组装抽油杆和端部接头的改进方法
US3977704A (en) Pipe coupler
CA3013422A1 (fr) Manchon conique composite
CN214334529U (zh) 一种船用玻璃钢gre管外压试验装置
US10563807B2 (en) Composite conical sleeve
CN107642649B (zh) 一种建筑施工耐压管道及其连接安装结构
CN104332190A (zh) 矿物绝缘组件及制备方法和具备矿物绝缘组件的安全装置
CN214120097U (zh) 排放湿烟气的烟囱防腐内套筒结构
CN216666748U (zh) 一种具有高抗压能力的pe电熔异径复合管
Kaddour et al. Burst behaviour of±75 filament-wound Kevlar/epoxy and carbon/epoxy tubes at high loading rates
Sällström et al. Status assessments of district heating pipes
CN221003735U (zh) 一种复合型密封垫片
CA3056324A1 (fr) Bouchons en plastique remplis de masse d'etancheite employes comme protection combinee contre le carburant et l'huile hydraulique ainsi que contre la foudre
CN204189459U (zh) 矿物绝缘组件和具备矿物绝缘组件的安全装置
US2189632A (en) Bushing
CN220668631U (zh) 一种抗压防爆的结构壁管
CN112629721B (zh) 一种用于高压电缆及附件的界面压力检测及监测装置和方法
CN117167583B (zh) 一种智能管道封堵器
CN217061726U (zh) 一种换流变压器套管芯体中部密封结构
CN112229724B (zh) 一种爆裂预警探测装置报警灵敏度的检测方法
CN217130186U (zh) 一种新式耐腐蚀防喷器橡胶件

Legal Events

Date Code Title Description
AS Assignment

Owner name: LE CARBONE-LORRAINE A CORP. OF FRANCE, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ODOT, PATRICK;REEL/FRAME:005845/0475

Effective date: 19910826

STCF Information on status: patent grant

Free format text: PATENTED CASE

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 8

AS Assignment

Owner name: CARNONE LORRIANE APPLICATIONS ELECTRIQUES, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LE CARBONE LORRAINE;REEL/FRAME:013352/0250

Effective date: 20020923

FPAY Fee payment

Year of fee payment: 12